Provided is a computer-implemented method for preforming negative pressure testing, also known as an inflow test. In the method, a non-transitive computer readable medium storing a pressure analysis program for analysis of pressure data is provided that when executed, causes an information processing apparatus connected to an image display screen, to receive at least one of a plurality of inputs from a user, receive a plurality of pressure values from a sensor filter at least a subset of the plurality of pressure values, select one of a plurality of negative pressure testing models; run the filtered subset of pressure values through the selected negative pressure testing model; and store the values generated by the negative pressure testing model.